The Serzone is a gift from God that frees her from the immobilizing depression that would otherwise surround her and seep into her body like a poisonous fog.

Note:Serzone (Nefazodone) is an antidepressant. In 2004 it was discontinued in the US by Bristol-Myers Squibb.
http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0000956/

In spite of her depression, Mirabelle likes to think of herself as humorous. She can, when the occasion calls, become a wisecracker and buoyant party girl. This mood, Mirabelle thinks, sometimes makes her the center of attention at parties and gatherings. The truth is that these episodes of gaiety merely raise her to normal, but for Mirabelle the feeling is so exceptional that she believes herself to be standing out.

“I’m traveling too much right now,” he says. In this sentence, he serves notice that he would like to come into town, sleep with her, and leave. Mirabelle believes that he is expressing frustration at having to leave town and that he is trying to cut down on traveling. “So what I’m saying is that we should be allowed to keep our options open, if that’s okay with you.” At this point, Ray believes he has told her that in spite of what could be about to happen tonight, they are still going to see other people. Mirabelle believes that after he cuts down on his traveling, they will see...

Note:@SteveMartinToGo does the "he thinks"/"she thinks" scene so well.

She underplays Jeremy’s place in her heart as she thinks it might hurt Ray.